After reading about this at:

http://news.povray.org/povray.documentation.inbuilt/message/%3Cweb.57f3be98a39309ab21263ef70%40news.povray.org%3E/#%3Cw
eb.57f3be98a39309ab21263ef70%40news.povray.org%3E

I had to get another look for myself at what happens when changing viewpoint for
+z. Found the x and y rotations appear opposite, yet z remains counterclockwise
when seen from these different directions and with the change to x sign.

First is the usual view for many POV-Ray scenes with camera at a -z coordinate,
looking toward +z. The default 'up' +y and 'right' +x (or <4/3,0,0>).

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